The formation of Charon’s red poles from seasonally cold-trapped volatiles

@article{Grundy2016TheFO,
  title={The formation of Charon’s red poles from seasonally cold-trapped volatiles},
  author={William M. Grundy and Dale P. Cruikshank and G. Randall Gladstone and Carly J. A. Howett and Tod R. Lauer and John R. Spencer and Michael E. Summers and Marc W. Buie and Alissa M. Earle and Kimberly Ennico and Joel Wm. Parker and Simon B. Porter and Kelsi N. Singer and S. Alan Stern and Anne J. Verbiscer and Ross A. Beyer and Richard P. Binzel and Bonnie J. Buratti and Jason C. Cook and Cristina Dalle Ore and Cathy B. Olkin and Alex H. Parker and Silvia Protopapa and Eric Quirico and Kurt D. Retherford and Stuart J. Robbins and Bernard Schmitt and J. Stansberry and Orkan M. Umurhan and H. Weaver and Leslie A. Young and Amanda M. Zangari and Veronica Bray and Andrew F. Cheng and Wm. B. McKinnon and Ralph L. McNutt and J. M. Moore and Francis Nimmo and Dennis C. Reuter and Paul M. Schenk},
  journal={Nature},
  year={2016},
  volume={539},
  pages={65-68}
}
A unique feature of Pluto’s large satellite Charon is its dark red northern polar cap. Similar colours on Pluto’s surface have been attributed to tholin-like organic macromolecules produced by energetic radiation processing of hydrocarbons. The polar location on Charon implicates the temperature extremes that result from Charon’s high obliquity and long seasons in the production of this material. The escape of Pluto’s atmosphere provides a potential feedstock for a complex chemistry. Gas from… 
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